<?php
/*
*  Created:  2011-04-03
*  session类
*  @Author nic <nic-chen@qq.com>
*
*/

class userClient {
	
	function userClient(){
	}

	function login($data){
		$this->_setAuthData($data);
	}
	
	function logout(){
		$this->_setAuthData('');
	}

	function getUserInfo(){
	    $uInfo = $this->_getAuthData();
	    if (empty($uInfo) || !is_array($uInfo) ){
	    	return array();
		}else{
			return $uInfo;
		}
	}
	// ------------------------------------------------------------------------------
	function _setAuthData($data){
		 $exp  = empty($data) ? APP_LOCAL_TIMESTAMP-3600*24*365 : USER_COOKIE_TIME;
		 $data = empty($data) ? '' : $this->_authcode(serialize($data),'ENCODE');
		 setcookie(CLIENT_COOKIE, $data, $exp, '/');
	}
	
	function _getAuthData(){ 
		$code = V('c:'.CLIENT_COOKIE);
		$vStr = $this->_authcode($code, 'DECODE');
		$vArr = unserialize($vStr);
		return  $vArr ;
	}
	
	// UC 的加密，解密算法
	function _authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {
		$ckey_length = 4;

		$key = md5($key ? $key : COOKIE_AUTH_KEY);
		$keya = md5(substr($key, 0, 16));
		$keyb = md5(substr($key, 16, 16));
		$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';

		$cryptkey = $keya.md5($keya.$keyc);
		$key_length = strlen($cryptkey);

		$string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + APP_LOCAL_TIMESTAMP : 0).substr(md5($string.$keyb), 0, 16).$string;
		$string_length = strlen($string);

		$result = '';
		$box = range(0, 255);

		$rndkey = array();
		for($i = 0; $i <= 255; $i++) {
			$rndkey[$i] = ord($cryptkey[$i % $key_length]);
		}

		for($j = $i = 0; $i < 256; $i++) {
			$j = ($j + $box[$i] + $rndkey[$i]) % 256;
			$tmp = $box[$i];
			$box[$i] = $box[$j];
			$box[$j] = $tmp;
		}

		for($a = $j = $i = 0; $i < $string_length; $i++) {
			$a = ($a + 1) % 256;
			$j = ($j + $box[$a]) % 256;
			$tmp = $box[$a];
			$box[$a] = $box[$j];
			$box[$j] = $tmp;
			$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
		}

		if($operation == 'DECODE') {
			if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - APP_LOCAL_TIMESTAMP > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {
				return substr($result, 26);
			} else {
				return '';
			}
		} else {
			return $keyc.str_replace('=', '', base64_encode($result));
		}
	}
}
?>